Overclock a 3930K

mmj_uk said:
It's up to you really, I wouldn't go over 1.35V personally with it being a £450 chip.. I'm being extra careful and staying at around 1.3V as I plan to keep this long term. If you are fearless then it's probably going to depend on how good your cooling is, at over 1.4V you're probably going to need exotic cooling.
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yes i want to keep mine for a good 4 years so dont want to kill it lol i think i might try 4.5ghz and if i can get that on the 1.290 or a 1.300 vcore or close to it then ill be happy what overclock you got on yours with vcore?
 
4.6ghz with a little over 1.3V and similar temps to yours, I've not tried any higher perfectly happy with this... I don't really want to be stressing about too high temps/volts for the sake of a few hundred more mhz.
 
ok so at least i know im in the right ball park with mine its because ive never done an overclock before i wasnt sure on what to do and what figures to use its just abit daunting with a cpu that cost £450 lol

I think if i get it to 4.5ghz ill be happy not too shabby an overclock of 1.3ghz from the original base clock :D
 
I figured out IBT basically it was me being impatient :o it stays at 142W for about 20sec presumably while it caches 10GB of RAM and then it starts working properly and goes to 190W ish.

6 threads still seems to be the most stressful for some reason.
 
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mmj_uk said:
I figured out IBT basically it was me being impatient :o it stays at 142W for about 20sec presumably while it caches 10GB of RAM and then it starts working properly and goes to 190W ish.

6 threads still seems to be the most stressful for some reason.
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is that the part where it says power values and then it says cpu package is that where your looking?
 
I'm looking at Coretemp where it says Power just above the temp readouts, Aida is probably getting the same reading.

I get higher temps in IBT with 6 threads even though CPU usage is not 100%, with 12 threads it goes to 100% and power is similar but temp is a lot lower.

EDIT: 175Gflops with 6 threads.
 
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Yeah so I'm still confused by IBT, if I select 'All' or 12 threads I get 100% usage across all cores but a lower temp... if I select 'Auto' or 6 threads I get about 50% usage across all cores but a higher temp.

Either some kind of power limiter is in play that I haven't set or IBT is not SB-E friendly. Power reading is 198W.

EDIT: I've been through all the BIOS settings relating to current/power limits and IBT doesn't change at all, I think it's just not optimised for more than 6 threads with SB-E.
 
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mmj_uk said:
4.6ghz with a little over 1.3V and similar temps to yours, I've not tried any higher perfectly happy with this... I don't really want to be stressing about too high temps/volts for the sake of a few hundred more mhz.
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Is that using the multi or the strap?
 
Just the mutiplier with a P9X79 Pro, I had a X79-UD3 briefly and couldn't get 4.6ghz to save my life with that (using the same chip), kept getting some xxxxx124 BSOD with the Gigabyte board at 4.6ghz.
 
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well i tried 4.5 this moring and it wouldnt do it with 1.310v im tempted to put a little more through but havent got time to play atm its stable at 4.4ghz with 1.290v i havent changed anythin other than the multiplyer and the vcore should i be changing somthing else to get 4.5ghz?
 
Set the cpu loadline calibration to medium or high in the Digi+ menu it will reduce voltage droop under load, I'm not sure what auto defaults to presumably regular.

I must have got lucky with chip it is it rather new and a C2 stepping, tbh I was willing to settle for 4.2-4.4 when I got it 4.6 is just a bonus.
 
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ah yes i remeber somthing about the cpu loadline in the video you said about i might try that and i def think mine will do 4.5 or 4.6 but i dont want to put too much vcore on as i dont want it too shorten the life of the cpu also i think if i knew what the other settings did i reckon they would help get it too that but i dont want to mess around too much
 
I forgot I've also set the phase modes in Digi+ menu to Extreme, although I don't know how much of a difference it's made if any. The options are Standard, Asus optimised and Extreme I think the first two are just more power efficient.
 
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Been having a play with the 3930K today too.
Mine is also C2 stepping and is doing very well.
So far i'm at 5GHz with 1.45v - I am using good water cooling (H100) and therefore temps are nice and low, so I feel quite safe with voltages up to 1.5v
 
mmj_uk said:
Nice overclock mate.

What motherboard do you have? Asus?
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Yea the Rampage IV Formula.
I should point out that 5GHz is not yet Prime stable.
I can get to 5158MHz and run SuperPi, but what ever I try above that results in a crash.

I suspect 4.8GHz stable will be all the way based on my early testing... but you never know.

I'm just going to try stepping down the voltages and find some stability with sensible voltages.
 
3930 C2 can get 5ghz Prime stable with good cooling quite easy. Where the difficulty is, is getting your RAM tuned for top performance and MHZ at these higher speeds.

Hey remember High LLC often needs active cooling on VRMs to stop them causing CPU throttling.
 
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From what I've read on X79 overclocking LLC adjustments are not required as per vanilla Sandybridge and the auto setting will do fine.
 
It depends on the board and the auto setting!!!! Why take a chance and just make sure you have the correct setting by applying it manually.The ASUS board I have applies very aggressive LLC as you scale mhz. It does this with sub ambient cooling in mind. With anything above high LLC applying way above what you set as Vcore in bios and also applying high current causing extra heat in the VRMS and socket area.

Set regular or high tops on ASUS boards is my advice on LLC unless your cooling is sub ambient.
 
mmj_uk said:
Change where it says Offset to Manual and then set a voltage manually, I use 1.3V for 4.6ghz with my 3930K.

You will find this useful:

he explains offset/manual at 38mins mark.
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Thank the Gods for that video:cool: I've never overclocked in my life. I was using the turbo setting in the AI Suite to get an overclock @4.2ghz used the exact same settings as in the video and have it running nicely @4.8ghz now (I'll give it a days use to 100% confirm that) but it's nice to have the cpu speeds still fluctuate when in/out of use.


I thought getting to 5.0ghz was impossible, I guess not if only I was more knowledgeable on the subject I'd push my system a little further :D that or setting my fans to full blast but I'd rather have a quiet system at 4.8 than a jet engine at 5ghz+
 
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